If you ask four people how often you should wash your beard, you will get five answers. The following is my take, but I trust you'll experiment and find what works for you. But before I offer my $.02, I know guys with amazing beards that swear by weekly shampooing and others that go daily. So, it is not like one or other other is a guaranteed terrible idea. I shampoo every day or two and I always use conditioner. I shampoo more or less often depending how messy of an eater I have been more than anything, (or if I have been around smoking or other things that stick to hair). More important that HOW OFTEN is HOW you condition.
If you use a soap or shampoo that is not too harsh and you scrub the skin under your beard well, you will clear out the microorganisms that cause a lot of itchiness and flaking. (This is the same reason we scrub our underarms with soap).
Update June 2018: As of March 2018, we have a fantastic Beard Shampoo. Try it, if you haven't yet. The shampoo is specially formulated for beards but suitable for all hair, our beard wash cleans your hair and skin without robbing them of the oils necessary to keep them hydrated and healthy. Clean and healthy beards are less dry, and less prone to itchiness and flaking. Our shampoo is designed to keep your beard looking its best.
Use a good beard oil every day or every other. You don't need a ton. Just a nickel sized pool in your hand. Start at the ends and work your way toward your face. Contrary to what you may have heard, the goal isn't to coat your chin skin with oil like putting maple syrup on pancakes. Your skin already produces oils. You are getting the parts of the hair that your sweat doesn't reach. If you have flakes--skin conditions notwithstanding--it is your cleaning regimen NOT a lack of beard oil that is to blame.
Like I said above, there are LOTS of strong opinions. Mine come from experience and from conversations with barbers, Title Beard and trainers at the Aveda institute so I tend to take them at their word as experts. The good news is, it is relatively inexpensive to experiment and find out what works for you! Be sure to check out the TitleBeard Facebook page again for tons of reviews and tips!
"...I wash my beard everyday. Many beardsman advocate only washing once or twice a week, but I have always said that with proper cleansing and conditioning products, daily washing is fine. But if you don’t like washing your everyday, don’t! Also, on average, I condition my beard in the morning after I get out of the shower, and again before I go to bed, and if I decide to use a beard wax to achieve a particular look that day, I may end up using anywhere from 3-4 different beard products throughout the day. Do you have to do this? Absolutely not, it is simply what works for me."